% This is a single-file LaTeX document for testing
\documentclass{article}

\usepackage{natbib}

\begin{document}

\title{Single File Document}
\author{Test Author}
\maketitle

\section{Introduction}

This is a citation \cite{kitchin-2015-examp}.

\section{Methods}

More text with citations \cite{smith2020,jones2019}.

\bibliographystyle{plain}
\bibliography{references,extra-refs}

\end{document}
